https://app.gfb.com.au/storage/uploads/1656481931_T9010_Instructions.pdf
I'm looking to purchase the GFB Respons BOV for my VN. Upon looking at their instructions linked above(page 3), it appears that the spring preload adjuster doesn't affect how much boost holding under throttle, unlike many BOVs out there. But rather, it affects how quickly, and for how long, the purge valve opens and closes on throttle lift. Since the boost control solenoid controls when the BOV actuates, the BOV operation is not 'direct' from vacuum lines.
So my question is, does the spring pre-load still need to be 'tuned' for the VN? Would leaving it in the 'softest' position just purge air any time I get off the throttle? And would leaving it in the tightest position cause compressor surge because the pressurized air would have nowhere to escape besides rushing back in to the turbo? I assume that tuning the spring preload would be best to reach optimal operation, but I wanted to hear peoples' take on it.
I'm looking to purchase the GFB Respons BOV for my VN. Upon looking at their instructions linked above(page 3), it appears that the spring preload adjuster doesn't affect how much boost holding under throttle, unlike many BOVs out there. But rather, it affects how quickly, and for how long, the purge valve opens and closes on throttle lift. Since the boost control solenoid controls when the BOV actuates, the BOV operation is not 'direct' from vacuum lines.
So my question is, does the spring pre-load still need to be 'tuned' for the VN? Would leaving it in the 'softest' position just purge air any time I get off the throttle? And would leaving it in the tightest position cause compressor surge because the pressurized air would have nowhere to escape besides rushing back in to the turbo? I assume that tuning the spring preload would be best to reach optimal operation, but I wanted to hear peoples' take on it.